Bump protobuf version to beta-3.3
It’s just the merge of beta-3.1 and beta-3.2, both of which we need.
diff --git a/examples/cpp/helloworld/Makefile b/examples/cpp/helloworld/Makefile
index 780e5e4..b45b3c7 100644
--- a/examples/cpp/helloworld/Makefile
+++ b/examples/cpp/helloworld/Makefile
@@ -97,7 +97,7 @@
@echo "Please install Google protocol buffers 3.0.0 and its compiler."
@echo "You can find it here:"
@echo
- @echo " https://github.com/google/protobuf/releases/tag/v3.0.0-beta-2"
+ @echo " https://github.com/google/protobuf/releases/tag/v3.0.0-beta-3.3"
@echo
@echo "Here is what I get when trying to evaluate your version of protoc:"
@echo